Synthetic film suitable to be used in agriculture, advantageously as a cover in greenhouse cultivation, and relative production method, said synthetic film comprising a base layer consisting of at least two heterogeneous polymers having different molecular structures which cannot be combined from a molecular point of view, but which can be amalgamated due to their rheological characteristics, said method providing to set each of said heterogeneous polymers moving towards an extrusion head (22) of an extrusion device (11) by feed means (14) provided with heating means suitable to heat said polymers to a particular temperature, near the melting temperature of the polymer which has the lower melting point. <IMAGE>
